This image is part of a series that was created for an open textbook, Cell Biology, Genetics and Biochemistry for PreClinical Students. The textbook will be available Late 2021.
Preferred citation:
Kindred Grey (2021). "Metabolism of branched chain amino acids." CC BY 4.0.
Alternative text:
Leucine bidirectional arrow enzyme transaminase with α-ketoglutarate bidirectional arrow glutamate to α-ketoisocaproate arrow enzyme BCKAD with NAD+ arrow NADH and CoA arrow CO2 to isovaleryl-CoA arrow enzyme isovaleryl-CoA dehydrogenase with NAD+ arrow NADH to β-methylcrotonyl-CoA arrow enzyme β-methylcrotonyl-CoA carboxylase with HCO3 addition and ATP arrow ADP to β-methylglutaconyl-CoA arrow enzyme β-methylglutaconyl-CoA hydratase to °-hydroxy-β-methylglutaconyl-CoA (HMG-CoA) arrows enzyme HMG-CoA lyase to acetoacetate and acetyl CoA arrow TCA. Isoleucine bidirectional arrow enzyme transaminase with α-ketoglutarate bidirectional arrow glutamate to α-keto-β-methylglutarate arrow enzyme BCKAD with CoA arrow CO2 and NAD+ arrow NADH to α-methylbutyryl-CoA arrow with loss of acetyl-CoA to propionyl-CoA arrow enzyme propionyl-CoA carboxylase with HCO3 addition and ATP arrow ADP to methylmalonyl CoA arrow enzyme methylmalonyl-CoA mutase to succinyl-CoA arrow TCA. Valine bidirectional arrow enzyme transaminase with α-ketoglutarate bidirectional arrow glutamate to α-ketoisovalerate arrow enzyme BCKAD with CoA arrow CO2 and NAD+ arrow NADH to isobutyryl-CoA arrow propionyl-CoA. Odd chain fatty acyl CoA arrow text last three carbons only to propionyl CoA.